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Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state ArchiMer
Bergeron, Jean-pierre; Delmas, Daniel; Koueta, Noussithe.
In the 2000 and 2001 springtime periods, mesozooplankton samples were systematically taken during research cruises devoted to the study of the distribution and abundance of small pelagic fishes in the French part of the Bay of Biscay, NE Atlantic, continental shelf. Simultaneous activities of three enzymes were measured in these mesozooplankton samples, to characterize the main features of ecosystem function at a regional scale. The aim was to assess assimilation rates of carbohydrates, through pyruvate kinase activity, and protein, through trypsin activity, by the mesozooplankton community and the resulting overall productivity, through aspartate transcarbamylase activity. The highest influence on the pelagic environment was the strong difference in the...
Tipo: Text Palavras-chave: Rivers discharge; Phytoplankton distribution; Anchovy; Nutritional state; RNA/DNA ratio; Mesozooplankton; Metabolic descriptors; North-East Atlantic; Bay of Biscay.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00012/12290/9089.pdf
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Phytoplankton distribution from Western to Central English Channel, revealed by automated flow cytometry during the summer-fall transition ArchiMer
Louchart, Arnaud; Lizon, Fabrice; Lefebvre, Alain; Didry, Morgane; Schmitt, François G.; Artigas, Luis Felipe.
Automated pulse shape-recording flow cytometry was applied to address phytoplankton spatial distribution, at high frequency, in stratified and well mixed water masses in the Western and Central English Channel during the summer-fall transition. Cytometric pulse shapes derived from optical features of single cells allowed the characterization of eight phytoplankton groups. Abundance and total red fluorescence (chlorophyll a autofluorescence) per group were used to define six phytoplankton communities. Their distribution revealed high spatial heterogeneity. Abundance presented a longitudinal gradient for six over the eight groups and succession of brutal shifts along the cruise. Maximum values were often located near the Ushant front in the Western English...
Tipo: Text Palavras-chave: English Channel; Phytoplankton distribution; High resolution; Automated flow cytometry; Fronts; Mesoscale structure.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00601/71324/69752.pdf
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